010-619-J0 Rev B
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Figure 18:
AC Cord Strain Relief for IRU Shelves
6.5
Calculating Output Wire Size Requirements
Wire size is calculated by first determining the appropriate maximum voltage drop requirement. Using
the formula below calculate the CMA wire size requirement. Determine the size and number of conduc-
tors required to satisfy the CMA requirement.
CMA = (A x LF x K) / AVD, where:
•
CMA: Cross section of wire in circular MIL area
•
A: Ultimate drain in amps
•
LF: Conductor loop feet
•
K: 11.1 constant factor for commercial (TW type) copper wire
•
AVD: Allowable voltage drop
Check again that the ampacity rating of the cable meets the requirement for the installation application.
Consult local electrical codes (NEC, CEC, etc.) for guidelines. If required, increase the size of the cable
to meet the code.
6.6
DC Output
6.6.1
DC Output for Model 030-851-20 (maximum 3600W)
Chassis and Site Ground Connections
WARNING
:
For safety reasons, ensure the system is properly bonded to the building’s ground grid.
NOTE
:
This power system is suitable for installation as part of a Common Bonding Network (CBN) and
is intended to be used in a DC-C configuration (common DC return). In this configuration, both the shelf
chassis ground (via power system chassis ground) and common return shall be connected to the
building master ground bus (MGB) or floor ground bus (FGB), in a larger building, to ensure correct
operation of the system and to prevent drifting floating analog (especially current) readings.
The chassis is connected to the MGB via mounting brackets.
DC Output to Loads
DC output connections are made at the distribution module at the front of the shelf.
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